Now we know why Britney Spears isn't quite done with her upcoming album, Femme Fatale: She's cooking up a collaboration with none other than Black Eyed Peas frontman will.i.am. On Tuesday (February 8), the pop star took to her Twitter to share her excitement over the song with her fans.

"In the studio with @iamwill...you guys are gonna love this one," Spears tweeted.

"We're in the middle of it right now," Dr. Luke, who is serving as the album's executive producer alongside pop mastermind Max Martin, told Rolling Stone. "It's a little bit fluid right now. I can't even say at this stage what songs for sure are making it and what songs aren't. We're working with a lot of producers and overseeing it with her A&R and record label and management and trying to make something cohesive."

Spears' collaboration with will.i.am serves as just one of a handful of pop-star-assisted tracks that may appear on the singer's new album. Last week, JustJared.com reported that Ke$ha, who provided background vocals for a track on Brit's last album, wrote a dance tune for the pop princess called "Till the World Ends."

"It's one irresistibly catchy tune that, if it makes the album, will be an instant smash," the website described. "In fact, we still have the tune stuck in our head — and we can't get it out. It's 'TiK ToK' all over again!"

Are you excited to hear Britney and will.i.am's collabo? Share your thoughts in the comments!

Don't miss Britney Spears' "Hold It Against Me" video premiere Thursday, February 17, at 9:56 p.m. ET on MTV and MTV.com before a new episode of "Jersey Shore"!